Reciprocating saw mill



(No Model.) 3 SheetsSheet 1.

W. M. WILKIN.

REGIPROGATING SAW MILL.

Patented 001;. 9, 1883.

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No Model.)

W. M. WILKIN.

REGIPROGATING SAW MILL. No. 286,355. Patented Oct. 9, 1883.-

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(No Model.) 3' Sheets-Sheet- 3'.

W. M. WILKIN.

RBOIPROGATING SAW MILL.

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UNITED STATES \VILLIAM'l/I. IVILKIN, OF EAST SAGINAXV, MICHIGAN.

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SPECIFICATION forming part of Letters Patent No. 286,355, dated October9, 1883.

Application filed April 18, 1883. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM M. WILKIN, a citizen of the United States,residing at East Saginaw, in the county of Saginaw and State ofMichigan, have invented certain new and useful Improvements inReciprocating Saw Mills and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to devices for regulating the movements ofreciprocating saws, and particularly to what are known as gangsaws.

The particular devices to which my invention relates are those by whichthe saws are oscillated or thrown forward and back as they move up anddown, which movements are known as the rake and clearance of the saws.Heretofore these movements have been obtained by adjusting the sashcontaining the saws in guides, which are on pendulum-pieces pivoted onthe sides of the frame at the top and oscillating the pendulum by aneccentric on the crankshaft. Such a movement has also been varied bysetting the guides at the top of the sash at an angle to those at thebottom.

gree of oscillation is varied with those which regulate the feed in sucha manner that asv the feed is increased the rake of the saws will beincreased automatically and proportionately.

My device is illustrated in the accompanying drawings, as follows:

Figure 1 is a side view of the inside of the frame. Fig. 2 is a frontview with a part of the frame, -sash, &c., shown, and with parts of theframe in vertical section. Fig. 3 is a part of Fig. 2, enlarged. Fig. 4is atop view of the parts G G", e c, f, and E. Fig. 5 is a perspectiveView of the variable-link move ment. 7

The various parts are indicated by letters of reference, as follows:

A is the frame. B is the pendulum, which is pivoted to the frame at B,and is connected at B with the gearing, by which it is oscillated. G isthe sash or saw pitman. D D D, &c., represent the saw-sash and itsguide-blocks. E is the eccentric, which operates the gearing whichoscillates the pendulum. E is the eccentric-rod. E is a rock-arm. E is aconnectingrod. F is a rock-shaft, which extends across the top of theframe. f isa grooved head or link-block on one end of the shaft F. e isa link or bar, movable in the groove in said linkblock and connectedwith the connecting-rod 7 E. F is a crank or arm on said shaft F, ofwhich there is one on each side of the frame. F are links or bars, whichconnect the cranks or arms F with the pendulum-pieces B. G is ahandlever on the upright shaft G, which is adjusted on the outside ofthe frame. crank or arm on the top of this shaft, and G is a similarcrank on the bottom. 6 is a con necting-rod between the arm G and thelink- I is its shaft.

Heretofore, as V stated above, the pendulum has been pivoted at itsupper end, and as such an adjustment could not properly throw the sawsforward at the top to give the proper rake, diagonal guides for thesaw-sash were employed in connection with the pendulum. I pivot thependulum at or near the bottom, and move it by gearing at the top, andthus give the saws their oscillation at the top without the aid ofdiagonal guides. I may use diagonal guides, if so desired, to give stillI which moves the arm 6.

more rake to the saws.

Heretofore the rock-shaft F has been placed across the frame at thebottom, and connection from it was there made with the pendulum. I placeit at the top of the frame, and there make connection with the pendulum.Each revolution of theshaft S moves the saw-frame up and down, andthrough the eccentric E and gearing E Ei e f, F F F and pendulum Bthesaw-frame is oscillated or vibrated forward and back while it is movingdownand up. The forward movement is known as the rake, and occurs as thesaws go down, and the backward movement is known as the clearance, andoccurs as the saws go up. W'hen the pendulum is pivoted at the top thisforward movement all takes place at the bottom of the saws, and so doesnot produce the desired result; but when the pendulum is pivoted at ornear the lower end the forward movement properly throws the saws overonto the log, and gives a proper rake from the top of the cut,

The second part of my invention consists in making the amount of thisvibration of the pendulum variable. This is done by incorporating atsome point in the eccentric-gearing a shifting device or variable crankor link movement. This may be done by making the eccentric E ashiftingeccentric, such as is common in steam-enginevalve-gears 5 or alinkmovement or shifting crank-arm may be substituted for the rock-arm Eor it may be done, as shown, by a shifting-link or crank-arm, e, on therock-shaft F. This device is very simple, consisting, wholly, in varyingthe length of the arm 6, which is done by sliding it in the head f bymeans of the rod 6, crank G shaft G, and the lever G. Of course as thearm 6 is extended the shaft F is rocked through a shorter are by a givenmovement of the rod It is not essential that there be a rockarm, E forthe rod E may extend from the eccentric to the arm a.

The third feature of my invention consists in making the variation ofthe vibration of the pendulum automatically conformable with the speedof the feed-rollers, which is always made variable. If the character ofthe log is such that it can be fed to the saws faster than another, byreason of its size or the hardness of the wood, the saws should also betrimmed so as to cut deeper at each stroke-that is, given more rake. Soit will be observed that there should be community of action between thevariable feed and the variable rake. They should vary in unison. Thefaster the feed the more rake, and vice versa. The speed of the feed isdetermined by the position of the friction-gear H from the center of thedisk friction I. The nearer the friction-gear H is to the center of thedisk I the more rapid the feed, and vice versa. I move the friction-gearH by the arm G on the shaft G, which is the same shaft as that on whichthe arm G" is fixed,

So, therefore, any movement of the hand-lever G, which is in positionfor use by the sawyer, will vary the feeding of the log to the saw andthe rake of the saw in unison.

There 'may be many various kinds of speedregulators used in place of thefrictions H and I; and I do not desire to be limited to any particularkind, for it will be obvious to any mechanic how to make connectionbetween any ordinary speed-regulator and any variable rocking-gear.

It should be observed that the first part of my inventionviz., thependulum pivoted at or near the bottommay be used without a variablerocking gear, and it may be used with a variable rocking gear withoutbeing in connection with the variable feeding-gear; and the variablerocking gear may be used witha pendulum, which is pivoted at the top,either with or without connection with the variable feeding-gear.

\Vhat I claim as new is- 1. In a reciprocating saw mill, a sash-pendulumwhich holds all the guides of the sawsash, and thereby carries the saidsash bodily,

pivoted at or near its lower end, and moved by rocking mechanismconnected with it at or near its upper end, substantially as shown.

2. In a reciprocating saw mill, a saw-sash pendulum which holds all theguides of said sash, and thereby carries it bodily, pivoted at or nearits lower end, and moved by a variable rocking gear, connecting with itat or near its upper end, substantially as shown. I

3. In a reciprocating saw mill, the combination, substantially as shown,of a saw-sash pendulum which holds all the guides of the said saw-sash,and thereby carries it bodily, pivoted at one end, a variable rockinggear for moving said pendulum, a speed-regulator for varying the speedof the feeding mechanism, and, finally, a hand-lever which is geared tooperate both the shifting parts of the rocking gear and the speedregulator simultaneously.

4. In a reciprocating saw mill, the combination, substantially as shown,of a saw-sash pendulum which holds all the guides of said saw-sash, andtherefore carries it bodily, pivoted at or near its lower end, avariable rocking gear for moving said pendulum connecting therewith ator near its upper end, a speedregulator for varying the speed of thefeeding-rollers, and, finally, a hand-lever geared to operate both theshifting parts of the rocking gear and the speed -regulatorsimultaneously.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM M. \VILKIN.

\Vitnesses:

JNo. K. HALLQCK, G. SMALLEY.

